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01 Feb 2018, 00:22
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
66% (01:34) correct
34%
(01:17)
wrong
based on 150
sessions
History
Date
Time
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Not Attempted Yet
An airplane took off from airport P and later landed at airport R at the same time that another airplane landed at airport R, completing its flight from airport Q. If both flights were nonstop flights, which airplane flew at the faster average speed?
(1) The first plane took off a half hour before the second plane.
(2) The distance from P to R is greater than the distance from Q to R.
(1) The first plane took off a half hour before the second plane.
(2) The distance from P to R is greater than the distance from Q to R.
01 Feb 2018, 01:28
Kudos
Bookmarks
Bunuel
An airplane took off from airport P and later landed at airport R at the same time that another airplane landed at airport R, completing its flight from airport Q. If both flights were nonstop flights, which airplane flew at the faster average speed?
(1) The first plane took off a half hour before the second plane.
(2) The distance from P to R is greater than the distance from Q to R.
(1) The first plane took off a half hour before the second plane.
(2) The distance from P to R is greater than the distance from Q to R.
Let distance between P and R be d1 and distance between Q and R be d2. Let the time taken by first plane for its PR journey be t1 and let the time taken by second plane for its QR journey be t2.
So average speed of first plane = d1/t1
and average speed of second plane = d2/t2.
We have to compare these two speeds.
(1) This tells us that first plane travelled for half an hour more than second plane. So we have t1 = t2 + 0.5
Now speed of first plane = d1 / (t2 + 0.5)
and speed of second plane = d2/t2
But we cannot compare them without having any idea of d1 and d2. Not sufficient.
(2) d1 > d2. But without any idea of t1 and t2 we cannot compare. Not sufficient.
Combining the two statements, speed of first plane = d1 / (t2 + 0.5) and speed of second plane = d2/t2. We also know that numerator of first one d1 is greater than numerator of second one, d2. Also denominator of first one is greater than denominator of second one. Both numerator and denominator are larger, but we dont know by what percentage or by what fraction. So we cannot compare. Not Sufficient.
Hence E answer
16 Feb 2018, 02:41
Kudos
Bookmarks
Bunuel
An airplane took off from airport P and later landed at airport R at the same time that another airplane landed at airport R, completing its flight from airport Q. If both flights were nonstop flights, which airplane flew at the faster average speed?
(1) The first plane took off a half hour before the second plane.
(2) The distance from P to R is greater than the distance from Q to R.
(1) The first plane took off a half hour before the second plane.
(2) The distance from P to R is greater than the distance from Q to R.
Before going to the statements we know that we need to compare the speed. As both planes landed at the same place at same time, we need to know the time each flew or started and the distance traveled to compare the speed. So by keeping this in mind let us check the statement.
Stmt 1: It only says about the time the first plane took off relative to the second. As we don't know the distance, we can't deduce which flew faster. For example, if the distance between P and R is less than between Q and R, we can certainly say that Second plane traveled faster as it started half an hour before and reached at the same time. However, if the distance between P and R is greater than Q and R, we can't say whether First traveled faster or Second. Thus, Not Sufficient.
Stmt 2: It only says about the distance, so again we can't say which is faster as we don't know when they started.
Both: Even though now we have both that is first started half an hour before and first traveled more, we don't know when they started. Hence NS.
Ans E.
